H3C Technologies H3C S12500 Series Switches - Manual (Page 10)

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3. Fasten the captive screws on the front panel of the fan tray.
Figure 11 Installing a fan tray (for the S12508)
Installing a card
Slot requirements
Install MPUs, LPUs, and switching fabric modules into appropriate slots as shown in Figure 12 .
NOTE:
On an S12508 or S12518 switch, install at least one MPU, one interface card, and seven switching fabric
modules.